1885.] DURING THE VOYAGE OF H.M.S. 'CHALLENGER.' 917 



As in M. typica the anterior part of the body, consisting of the 

 head and of the first four segments of the thorax, is wider than the 

 posterior region of the thorax and the abdomen ; the first segment 

 of the thorax is the smallest, the second is the largest and projects 

 considerably dorsally above the general surface of the body ; the 

 two next segments are a trifle smaller and subequal. The fifth 

 segment is triangular in shape, very narrow anteriorly, and wider 

 posteriorly ; it is longer than either of the succeeding segments, 

 which are very short ; the seventh is almost fused with the abdo- 

 minal segment ; the latter is long, with a narrow median raised 

 area ; it terminates in two minute posterior tubercles, outside of 

 which are the uropoda. The surface of the body is smooth and 

 devoid of spines. 



The mandibles have no palp. 



Station 168, 1100 fathoms, 



2. MUNNOPSIS LATIFRONS, U. Sp. 



A single example, female, measuring 15 millim. in length, from 

 N. Pacific, off Japan. 



The head is long in proportion to the other segments ; it is as 

 long as the first three taken together ; the first four segments of 

 the thorax appear on a dorsal view to be subequal ; the lateral 

 regions, however, increase progressively in length from before back- 

 wards ; the segments are excavated above. The three posterior seg- 

 ments of the body do not differ widely in transverse diameter from 

 ti;e anterior segments as they do in M. typica ; their shape is more 

 like that of Eurycope ; the first of these segments is decidtdly the 

 shortest in the dorsal region, laterally they are all subequal in antero- 

 posterior diameter. The abdomen is rather damaged, it appears to 

 be oval in form, and rounded off at its free extremity ; laterally, 

 and in front of the articulation of the long styliform uropoda is 

 a spiny process directed backwards; the antennae are of great length, 

 measuring 87 millim. ; the flagellum is very much shorter than the 

 last joint of the peduncle, measuring only 5 millim. The mandible 

 has a palp. 



The first pair of thoracic appendages form a very distinct pre- 

 hensile band ; the last three pairs of appendages are natatory and 

 like those of M. typica. 



Station 232, 345 fathoms. 



3. MuNNOPSIS AUSTRALIS, n. Sp. 



The third and last species which I refer to this genus is repre- 

 sented by a single individual, dredged between Prince Edward's 

 Island and the Croze^s. It measures 8 millim. in length. 



The body has the typical form of the genus. The first segment 

 of the thorax is very short, the second five or six times as long, and 

 subequal with the two next. The width of the body is greatest at 

 the second segment. The remaining segments of the thorax (5-7) 

 are extremely narrow ; the first of those segments is very much the 

 longest, perhaps three times as long as either of the following. 



